HARQ Codebook Multiplexing for URLLC and eMBB Prioritization
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Solution Overview
Problem
Existing techniques have not been accepted by 3GPP to effectively prioritize Ultra-Reliable and Low-Latency Communications (URLLC) traffic and associated HARQ feedback over other types of transmissions in 5G networks.
Innovation Solution
The method involves a user equipment (UE) generating separate HARQ codebooks for URLLC and other services, multiplexing the HARQ information for URLLC with the other service's HARQ codebook, and transmitting the multiplexed HARQ codebook using URLLC communication resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback for URLLC and eMBB are transmitted separately using separate resources, then URLLC reliability is improved, but system resource efficiency deteriorates due to redundant transmissions
Solution Approach 1:
The patent combines URLLC HARQ-ACK feedback and eMBB HARQ-ACK feedback into a single multiplexed codebook transmitted on one resource. This merging approach eliminates redundant separate transmissions while maintaining the reliability requirements for URLLC through proper prioritization and timing mechanisms defined in the standard.
2Speed
If HARQ feedback for eMBB is dropped to prioritize URLLC traffic, then URLLC latency is improved, but eMBB system efficiency deteriorates due to retransmissions
Solution Approach 1:
The patent implements dynamic prioritization where the handling of eMBB and URLLC HARQ feedback adapts based on timing relationships and service requirements. The system dynamically determines whether to multiplex feedback together or prioritize URLLC separately based on current conditions, allowing flexible optimization of both latency and efficiency.
Solution Approach 2:
The patent uses preliminary actions by defining specific timing relationships (K1 values, offset parameters) that pre-determine when HARQ feedback should be transmitted. This allows the system to proactively schedule feedback transmissions to avoid conflicts before they occur, rather than reactively dropping feedback when conflicts arise.
3Adaptability or versatility
If separate HARQ codebooks are generated for URLLC and eMBB, then service differentiation is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal HARQ-ACK codebook structure that can accommodate multiple service types (URLLC and eMBB) within a single feedback mechanism. This multi-functional approach allows the system to differentiate services through configuration parameters and timing while using a unified codebook format, reducing the complexity of maintaining separate codebook generation and transmission paths.
Data Source
AI summary
A communication system is disclosed in which a user equipment (UE) receives data associated with an Ultra-Reliable and Low-Latency Communications (URLLC) service and data associated with an Enhanced Mobile Broadband (eMBB) service. The UE generates a first Hybrid Automatic Repeat Request (HARQ) codebook for URLLC service and a second HARQ codebook for the eMBB service, bundles the first HARQ codebook into a single bit, and appends it to the end of the second HARQ codebook to form a multiplexed HARQ codebook. The UE then transmits the multiplexed HARQ codebook to the access network node.